get user profile avatar from facebook/google plus/twitter/sina weibo, etc

weibo via api

$ curl 'https://api.weibo.com/2/users/show.json?uid=1717675430&access_token=2.008JbFTD0aByTEcd6d0b28a30plcC6'

{"id":1717675430,"idstr":"1717675430","screen_name":"蕭敬騰","name":"蕭敬騰","province":"71","city":"1","location":"台湾 台北市","description":"喜鵲娛樂+886-2-2782-3000 http://www.chinafun.com.tw/","url":"http://www.jamsclub.asia/","profile_image_url":"http://tp3.sinaimg.cn/1717675430/50/5629611856/1","profile_url":"iamxiaojingteng","domain":"iamxiaojingteng","weihao":"","gender":"m","followers_count":10316393,"friends_count":131,"statuses_count":2843,"favourites_count":0,"created_at":"Wed Mar 24 14:09:44 +0800 2010","following":false,"allow_all_act_msg":false,"geo_enabled":false,"verified":true,"verified_type":0,"remark":"","status":{"created_at":"Tue Jul 02 14:11:37 +0800 2013","id":3595617584807400,"mid":"3595617584807400","idstr":"3595617584807400","text":"[嘻嘻][嘻嘻][嘻嘻]//@黃子佼:[哈哈][哈哈][哈哈]","source":"HTC","favorited":false,"truncated":false,"in_reply_to_status_id":"","in_reply_to_user_id":"","in_reply_to_screen_name":"","pic_urls":[],"geo":null,"reposts_count":0,"comments_count":0,"attitudes_count":0,"mlevel":0,"visible":{"type":0,"list_id":0}},"allow_all_comment":true,"avatar_large":"http://tp3.sinaimg.cn/1717675430/180/5629611856/1","avatar_hd":"","verified_reason":"台灣歌手","follow_me":false,"online_status":0,"bi_followers_count":128,"lang":"zh-tw","star":0,"mbtype":12,"mbrank":4,"block_word":0}

guess the path: http://www.zhihu.com/question/19630156

get avatar from google profiles, facebook, gravatar, twitter, tumblr

function get_avatar_from_service(service, userid, size) {
    // this return the url that redirects to the according user image/avatar/profile picture
    // implemented services: google profiles, facebook, gravatar, twitter, tumblr, default fallback
    // for google   use get_avatar_from_service('google', profile-name or user-id , size-in-px )
    // for facebook use get_avatar_from_service('facebook', vanity url or user-id , size-in-px or size-as-word )
    // for gravatar use get_avatar_from_service('gravatar', md5 hash email@adress, size-in-px )
    // for twitter  use get_avatar_from_service('twitter', username, size-in-px or size-as-word )
    // for tumblr   use get_avatar_from_service('tumblr', blog-url, size-in-px )
    // everything else will go to the fallback
    // google and gravatar scale the avatar to any site, others will guided to the next best version
    var url = '';
 
    switch (service) {
 
    case "google":
        // see http://googlesystem.blogspot.com/2011/03/unedited-google-profile-pictures.html (couldn't find a better link)
        // available sizes: all, google rescales for you
        url = "http://profiles.google.com/s2/photos/profile/" + userid + "?sz=" + size;
        break;
 
    case "facebook":
        // see https://developers.facebook.com/docs/reference/api/
        // available sizes: square (50x50), small (50xH) , normal (100xH), large (200xH)
        var sizeparam = '';
        if (isNumber(size)) {
            if (size >= 200) {
                sizeparam = 'large'
            };
            if (size >= 100 && size < 200) {
                sizeparam = 'normal'
            };
            if (size >= 50 && size < 100) {
                sizeparam = 'small'
            };
            if (size < 50) {
                sizeparam = 'square'
            };
        } else {
            sizeparam = size;
        }
        url = "https://graph.facebook.com/" + userid + "/picture?type=" + sizeparam;
        break;
 
    case "gravatar":
        // see http://en.gravatar.com/site/implement/images/
        // available sizes: all, gravatar rescales for you
        url = "http://www.gravatar.com/avatar/" + userid + "?s=" + size
        break;
 
    case "twitter":
        // see https://dev.twitter.com/docs/api/1/get/users/profile_image/%3Ascreen_name
        // available sizes: bigger (73x73), normal (48x48), mini (24x24), no param will give you full size
        var sizeparam = '';
        if (isNumber(size)) {
            if (size >= 73) {
                sizeparam = 'bigger'
            };
            if (size >= 48 && size < 73) {
                sizeparam = 'normal'
            };
            if (size < 48) {
                sizeparam = 'mini'
            };
        } else {
            sizeparam = size;
        }
 
        url = "http://api.twitter.com/1/users/profile_image?screen_name=" + userid + "&size=" + sizeparam;
        break;
 
    case "tumblr":
        // see http://www.tumblr.com/docs/en/api/v2#blog-avatar
        //TODO do something smarter with the ranges
        // available sizes: 16, 24, 30, 40, 48, 64, 96, 128, 512
        var sizeparam = '';
        if (size >= 512) {
            sizeparam = 512
        };
        if (size >= 128 && size < 512) {
            sizeparam = 128
        };
        if (size >= 96 && size < 128) {
            sizeparam = 96
        };
        if (size >= 64 && size < 96) {
            sizeparam = 64
        };
        if (size >= 48 && size < 64) {
            sizeparam = 48
        };
        if (size >= 40 && size < 48) {
            sizeparam = 40
        };
        if (size >= 30 && size < 40) {
            sizeparam = 30
        };
        if (size >= 24 && size < 30) {
            sizeparam = 24
        };
        if (size < 24) {
            sizeparam = 16
        };
 
        url = "http://api.tumblr.com/v2/blog/" + userid + "/avatar/" + sizeparam;
        break;
 
    default:
        // http://www.iconfinder.com/icondetails/23741/128/avatar_devil_evil_green_monster_vampire_icon
        // find your own
        url = "http://i.imgur.com/RLiDK.png"; // 48x48
    }
 
 
    return url;
}
 
 
// helper methods
 
function isNumber(n) {
    // see http://stackoverflow.com/questions/18082/validate-numbers-in-javascript-isnumeric
    return !isNaN(parseFloat(n)) && isFinite(n);
}